[stress testing] Add kubectl log comment to examples+generator above container name

If we add helpful comments inline to the configs, then it will help self-document some of the container fields for people gradually learning how to develop with kubernetes.

Example: a comment showing how to retrieve the container image above the container image field: https://github.com/Azure/azure-sdk-for-go/blob/f55e882ad6821e6ac2ea23601642c9dc2af08443/sdk/messaging/azservicebus/internal/stress/templates/deploy-job.yaml#L9

This issue could be expanded, but a first task would be adding the appropriate `kubectl logs -n -c ` command above the container name field.